What should you look for (and avoid) in getting feedback on your writing or other project?
Max Brooks, author of World War Z, said this in an short collection of tips on Publisher's Weekly:
"I’m very careful who I let proofread my unfinished work. Too often people will want to rewrite the entire story or take it in a direction I never intended. Vetting proofreaders over time allows me to find eyes and brains that want to help me get where I originally intended to go."
He calls it proofreading, which I associate with looking only for typos and spelling errors, but what he describes is more typical of people giving feedback on whether or not what you've written works. The danger he points to is that they, with all good intentions, start pointing you toward the way they would have written the story or scene, rather than givng you feedback that helps you write it better the way you intended to.
My advice is to ask them to stick to identifying the problem--maybe the scene feels like it goes on too long, or something isn't clear, or the dialogue doesn't come alive--and leave the solution to you.